
%\documentclass[letterpaper,12pt]{article}
%\usepackage[x11names,rgb]{xcolor}
%\usepackage{tikz}
%\usetikzlibrary{snakes}
%\usetikzlibrary{arrows}
%\usetikzlibrary{shapes}
%\usetikzlibrary{backgrounds}
%\usepackage{amsmath}
%\oddsidemargin 0in
%\evensidemargin 0in
%\topmargin 0in
%\headheight 0in
%\headsep 0in
%\textheight 9in
%\textwidth 6.5in
%\begin{document}
%\pagestyle{empty}
%\vspace*{\fill}
%\begin{center}
\documentclass{article}
 
\usepackage[pdftex,active,tightpage]{preview}
\usepackage{tikz}
\usetikzlibrary{snakes}
\usetikzlibrary{arrows}
\makeatletter
 
\begin{document}
\begin{preview}
	%%
	\begin{tikzpicture}[scale=2.0]
	
	\draw[fill=black!30] (0,0) rectangle (2,2);
	
	\draw[fill=white] (1.25,0.25) rectangle +(0.5,0.5);
	\draw[fill=white] (1.75,0.5) rectangle +(0.25,0.25);
	\draw[dashed] (1.75,0.25) -- ++(0.5,0) -- ++(0,0.5) -- +(-0.25,0);
	
	\draw[->] (1.7,0.95) -- (1.9,0.65); 
	\draw[->] (1,0.5) -- (1.4,0.5);
	
	\draw (1.74,1.2) node[left] {Boundary};
	\draw (1.74,1) node[left] {Octant};
	
	\draw (0.62,0.48) node[above] {Internal};
	\draw (0.62,0.52) node[below] {Octant};
	
	 
	\end{tikzpicture}%%
\end{preview}
\end{document}

%\end{center}
%\vspace*{\fill}
%\end{document}

    	